Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:18:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:40:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[X].size();++i) ^